JP2015101425A - Elevator and elevator braking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator capable of minutely controlling a slip between a winch and a rope even in an elevator car reduced in weight and consequently more shortening a brake distance of the elevator car, and further to provide an elevator braking method.SOLUTION: An elevator comprises: an elevator car; a weight; a rope for hoisting the elevator car and the weight; a winch for winching up the rope; a hoistway through which the elevator car is lifted up and down; a winch speed measurement section for detecting a speed of the winch; a speed measurement device for detecting a speed of the elevator car; and a controller for reducing braking torque of the winch when determining a slip between the winch and the rope to occur on the basis of outputs of the winch speed measurement section and the speed measurement device.

Description

  Embodiments described herein relate generally to an elevator and an elevator braking method.

  The elevator car in operation is braked by controlling the rotational speed of the hoisting machine, and the brake is activated after the car room stops.

  However, in the case of sudden braking of a running car room, it has been performed by using a conventional brake together. However, if the basket chamber is suddenly braked with a brake, slippage may occur between the hoist and the rope, and the braking distance may be increased.

  In this regard, the speed of the cage room and the speed of the main rope that lifts the cage room are detected, and when the speed of the main rope exceeds the speed of the hoist, the brakes are temporarily released, and both speeds are equal again. There has been proposed a technique for operating a brake when it becomes.

  However, since the weight of the cage room is currently reduced, the degree of sliding between the hoisting machine and the rope differs greatly depending on whether the number of passengers is large or small.

  Specifically, the degree of slippage is greater and the braking distance becomes longer when the mass of the cage chamber is larger than when the mass is small. On the other hand, the hoisting machine torque has not been specially controlled in the case of sudden braking.

  Therefore, it is difficult to sufficiently shorten the braking distance of the cage room only by performing the slip control only on the brake.

Japanese Patent Laid-Open No. 10-7350

  Therefore, an object of the present embodiment is to provide an elevator and an elevator braking method capable of finely controlling slippage between the hoisting machine and the rope even in a lightened cage room, and thereby shortening the braking distance of the cage room. And

  In order to solve the above-described problems, an embodiment includes a cage room, a weight, a rope that lifts the cage room and the weight, a hoist that winds the rope, a hoistway that raises and lowers the cage chamber, and a hoist The hoisting machine speed measuring unit that detects the speed of the hoisting machine, the speed measuring device that detects the speed of the cage room, and the slip between the hoisting machine and the rope based on the output of the hoisting machine speed measuring unit and the speed measuring device. When it determines with having, the control part which reduces the braking torque of a hoisting machine is provided.

It is a side view of an elevator. It is a block diagram which shows the structure of an elevator. It is a graph which shows the mode of the braking of the basket room at the normal time. It is a graph which shows the mode of braking of the basket room at the time of emergency braking. It is a figure which shows the example of a braking pattern table. It is a figure which shows operation | movement of an elevator.

  Hereinafter, an embodiment of an elevator and an elevator braking method will be described in detail with reference to the drawings.

  One embodiment of the elevator according to the present embodiment includes a cage room, a weight, a rope that lifts the cage room and the weight, a hoist that hoists the rope, a hoistway that raises and lowers the cage room, and the speed of the hoist Based on the output of the hoisting machine speed measuring unit, the speed measuring device for detecting the speed of the cage room, and the output of the hoisting machine speed measuring unit and the speed measuring device, it is determined that slippage has occurred between the hoisting machine and the rope. A control unit that reduces the braking torque of the hoisting machine.

  FIG. 1 is a side view of an elevator 100 according to the present embodiment. As shown in FIG. 1, an elevator 100 includes a cage room 101 in which passengers are placed, a weight 103, a rope 106 that lifts the cage room 101 and the weight 103, a hoisting machine 102 that winds up the rope 106, and a basket room 101. The hoistway 110 which goes up and down, the landing side door 104, the step part 105 installed under the landing side door 104, and the control part 107 which controls operation | movement of an elevator are provided.

  The basket room 101 includes a basket room side door 101A and an engagement device 101B installed on the hoistway 110 side of the basket room side door 101A.

  The elevator 100 also includes a mass sensor 101 </ b> C that detects the mass of the cage chamber 101 in the cage chamber 101.

  Further, the elevator 100 includes a speed measuring device 120 that detects the speed of the basket room 101. The speed measuring device 120 includes, for example, a speed measuring unit encoder 121A, and includes a first roller installed in the hoistway 110, a second roller 122 installed below the first roller 121 of the hoistway 110, and a first roller. An endless speed measuring rope 123 wound around the roller 121 and the second roller 122, and a connecting portion 124 connecting the speed measuring rope 123 and the cage chamber 101.

  When the basket chamber 101 moves, the speed measurement rope 123 rotates, and the first roller 121 rotates according to the movement of the speed measurement rope 123. The speed measuring unit encoder 121 </ b> A detects the rotation of the first roller 121 and outputs it to the control unit 107. Therefore, the control unit 107 can detect the speed of the basket room 101 by the speed measuring device 120.

  The elevator 100 includes a hoisting machine encoder 102A that is a hoisting machine speed measuring unit that detects the speed of the hoisting machine 102, and a brake 102B.

  The hoisting machine encoder 102 </ b> A detects the rotation of the hoisting machine 102 and outputs it to the control unit 107. Therefore, the control unit 107 can detect the rotational speed of the hoisting machine 102 by the hoisting machine encoder 102A.

  The brake 102B is controlled by the control unit 107, and is released when a current flows, and performs a braking operation when energized.

  The landing-side door 104 includes a protrusion 104A that engages with the engagement device 101B on the hoistway 110 side.

  The control unit 107 raises and lowers the basket room 101 to the designated destination floor. When the basket room 101 arrives at the destination floor, the engaging device 101B and the protrusion 104A are engaged. When the cage room side door 101A is opened and closed in this state, the landing side door 104 is driven and opened and closed.

  FIG. 2 is a block diagram showing the configuration of the elevator 100. As shown in FIG. 2, the elevator 100 includes a control unit 107 including a CPU that is an arithmetic unit, a hoisting machine 102, a hoisting machine encoder 102A, a brake 102B, a speed measuring unit encoder 121A, a memory, a hard disk, and the like. A storage unit 202 including the storage device and a mass sensor 101C.

  The control unit 107 controls the hoisting machine 102 and the brake 102B.

  The storage unit 202 stores a braking pattern table 202A that stores a hoisting machine torque control pattern corresponding to the mass of the basket chamber 101 detected by the mass sensor 101C.

  FIG. 3 is a graph showing how the basket chamber 101 is braked during normal operation. In FIG. 3A, the vertical axis represents the velocity v of the basket chamber 101, and the horizontal axis represents time.

  As shown in the graph 301 of FIG. 3A, in normal operation, the cage room 101 gradually increases in speed, performs the speed movement, and then gradually decreases in speed and stops.

  A graph 302 in FIG. 3B shows how the brake 102B is energized. The control unit 107 energizes the brake 102B to release the brake 102B while the basket chamber 101 moves.

  A graph 303 in FIG. 3C shows how the brake 102B is released and braked. The brake 102B is released during energization and performs a braking operation while energization is stopped.

  A graph 304 in FIG. 3D shows a current supplied to the hoisting machine. The torque of the hoisting machine 102 is determined by the supplied current. In FIG. 3D, + on the vertical axis indicates a current for generating torque for moving the cage chamber 101 downward, and-indicates a current for generating torque for moving the cage chamber 101 upward.

  FIG. 4 is a graph showing how the cage chamber 101 is braked during emergency braking. A graph 401 in FIG. 4A is a graph showing the speed of the basket room 101, the vertical axis shows the speed v of the basket room 101, and the horizontal axis shows time. A graph 304 in FIG. 4B shows the current supplied to the hoisting machine 102.

  As shown in FIGS. 4A and 4B, when a strong reverse torque is suddenly generated in the hoisting machine 102, slip occurs between the hoisting machine 102 and the rope 106, and the basket chamber 101 Can no longer brake the movement.

  Therefore, in the present embodiment, when the control unit 107 determines that slip has occurred between the hoisting machine 102 and the rope 106 based on the outputs of the hoisting machine encoder 102A and the speed measuring unit encoder 121A, the hoisting machine 102 Reduce the torque. Specifically, the control unit 107 detects that the difference between the speed of the hoisting machine 102 detected based on the output of the hoisting machine encoder 102A and the speed of the basket chamber 101 detected based on the output of the speed measuring unit encoder 121A is equal to or greater than a threshold value. In some cases, it is determined that slip has occurred between the hoisting machine 102 and the rope 106. This threshold may be zero.

  In the example of FIG. 4B, the control unit 107 shows an example in which the torque of the hoisting machine 102 is reduced to zero. The degree of torque to be reduced is determined by the control unit 107 by reading from the braking pattern table 202A based on the output of the mass sensor 101C.

  Furthermore, when the control unit 107 determines that no slip has occurred between the hoisting machine 102 and the rope 106 based on the outputs of the hoisting machine encoder 102A and the speed measuring unit encoder 121A, the control unit 107 increases the torque of the hoisting machine 102. It is generated again in the direction in which the basket chamber 101 brakes.

  Thereafter, this operation is continued until the basket room stops.

  FIG. 5 is a diagram illustrating an example of the braking pattern table 202A. As shown in the graph 501 in FIG. 5, the braking pattern table 202A stores the relationship between the mass of the cage chamber 101 and the braking torque so that the braking torque increases as the mass of the cage chamber 101 increases.

  FIG. 6 is a diagram illustrating the operation of the elevator 100. As shown in FIG. 6, in step 601, the control unit 107 determines whether there is an instruction for sudden braking. The control unit 107 proceeds to step 602 when determining that there is an instruction for sudden braking, and returns to step 601 when determining that there is no instruction for sudden braking.

  In step 602, the control unit 107 operates the brake 102B. Note that step 602 can be omitted. When step 602 is omitted, the brake 102B is operated after the basket chamber 101 stops.

  In step 603, the control unit 107 acquires the mass of the basket chamber 101 from the output of the mass sensor 101C.

  In step 604, the control unit 107 reads a braking torque corresponding to the mass of the basket chamber 101 from the braking pattern table 202A.

  In step 605, the control unit 107 applies a braking torque with the braking torque read into the hoisting machine 102.

  In step 606, the control unit 107 acquires the speed of the hoisting machine 102 from the output of the hoisting machine encoder 102A.

  In step 607, the control unit 107 acquires the speed of the basket room 101 from the output of the speed measuring unit encoder 121A.

  In step 608, the control unit 107 determines whether the speed of the basket chamber 101 exceeds the speed of the hoisting machine 102. If so, the control unit 107 determines that slip has occurred between the hoist 102 and the rope 106, and proceeds to step 609. If not exceeded, the control unit 107 determines that no slip has occurred between the hoisting machine 102 and the rope 106, and proceeds to step 610.

  In step 609, the control unit 107 loosens the braking torque of the hoisting machine 102. The degree of torque to be loosened may be loosened until the torque becomes zero, or the degree of loosening corresponding to the mass of the basket chamber 101 may be separately stored in the braking pattern table 202A, and the degree of loosening may be read out. Good.

  In step 610, the control unit 107 maintains the braking torque.

  In step 611, the control unit 107 determines whether the basket room 101 has stopped. When it is determined that the basket chamber 101 is not stopped, the control unit 107 returns to step 606, and when it is determined that the basket chamber 101 is stopped, the brake 102B is operated and the processing is ended.

  As described above, the elevator according to the present embodiment includes the cage room 101, the weight 103, the rope 106 that lifts the cage room and the weight, the hoisting machine 102 that winds the rope 106, and the hoistway in which the cage room moves up and down. 110, a landing side door 104, a hoisting machine speed measuring unit for detecting the speed of the hoisting machine 102, a speed measuring device 120 for detecting the speed of the basket chamber 101, and outputs of the hoisting machine speed measuring unit and the speed measuring device 120. And a control unit 107 that reduces the braking torque of the hoisting machine 102 when it is determined that slippage has occurred between the hoisting machine 102 and the rope 106.

  Therefore, even in the lightened cage room, the sliding between the hoisting machine and the rope can be finely controlled, so that the braking distance of the basket room can be further shortened.

  Although several embodiments have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

101: basket chamber 101C: mass sensor 102: hoisting machine 102A: hoisting machine encoder 102B: brake 104: landing side door 105: step unit 107: control unit 121A: speed measuring unit encoder

Claims (6)

A basket room,
A weight,
A rope for lifting the basket chamber and the weight;
A hoist to wind up the rope;
A hoistway in which the basket room moves up and down;
A hoisting speed measuring unit for detecting the speed of the hoisting machine;
A speed measuring device for detecting the speed of the basket room;
A controller that reduces braking torque of the hoisting machine when it is determined that slippage has occurred between the hoisting machine and the rope based on outputs of the hoisting machine speed measuring unit and the speed measuring device; ,
Elevator equipped with. The controller is
The braking torque is again generated in the hoisting machine when it is determined that slippage between the hoisting machine and the rope has been eliminated based on outputs of the hoisting machine speed measuring unit and the speed measuring device. Elevator. A mass sensor for detecting the mass of the basket chamber;
A braking pattern table storing a braking torque pattern of the hoist according to the mass of the basket chamber;
Further comprising
The controller is
When it is determined that slip has occurred between the hoisting machine and the rope based on the outputs of the hoisting machine speed measuring unit and the speed measuring device, according to the mass of the cage chamber detected by the mass sensor. The elevator according to claim 2, wherein the braking torque is read from the braking pattern table and the braking torque is generated in the hoist.   Slip occurs between the hoisting machine and the rope based on the output of the hoisting machine speed measuring unit that detects the speed of the hoisting machine that winds up the rope that suspends the cage room and the speed measuring device that detects the speed of the car room. An elevator braking method for reducing the braking torque of the hoisting machine when it is determined that the hoisting machine is engaged.   The braking torque is generated again in the hoisting machine when it is determined that slippage between the hoisting machine and the rope has been eliminated based on the outputs of the hoisting machine speed measuring unit and the speed measuring device. Elevator braking method. When it is determined that slip has occurred between the hoisting machine and the rope based on the output of the hoisting machine speed measuring unit and the speed measuring device, the hoisting machine according to the mass of the cage chamber Reading the braking torque according to the mass of the cage chamber detected by a mass sensor that detects the mass of the cage chamber from a braking pattern table storing a braking torque pattern;
The elevator braking method according to claim 5, wherein the read braking torque is generated in the hoist.

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